The love affair between Arctic Monkeys and Queens of the Stone Age remains hot and heavy. Already this year, Alex Turner guested on QOSTA’s …Like Clockwork, which Josh Homme reciprocated by appearing on AM. Last month, QOSTA covered the Monkeys’ “Why’d You Only Call Me When You’re High?”, and on Tuesday night, Homme made a surprise appearance during the Monkeys’ set in Los Angeles, siting in for a performance of “Knee Socks” from AM. Watch fan footage of the steamy moment below (via We All Want Someone To Shout For). Can these guys just get a room already?